Fix DM build failures.

dm/DM.cpp

 // Main binary for DM.
 // For a high-level overview, please see dm/README.
 
 #include "GrContext.h"
 #include "GrContextFactory.h"
 #include "SkCommandLineFlags.h"
 #include "SkForceLinking.h"
 #include "SkGraphics.h"
 #include "gm.h"
 
@@ skipping 111 matching lines @@
     }
 }
 
 class NoExpectations : public ExpectationsSource {
 public:
     Expectations get(const char* /*testName*/) const SK_OVERRIDE {
         return Expectations();
     }
 };
 
-
-int main(int argc, char** argv) {
+int tool_main(int argc, char** argv);
+int tool_main(int argc, char** argv) {
     SkGraphics::Init();
 
     SkCommandLineFlags::Parse(argc, argv);
     GM::SetResourcePath(FLAGS_resources[0]);
     SkTArray<SkString> configs;
     for (int i = 0; i < FLAGS_config.count(); i++) {
         split(FLAGS_config[i], ", ", &configs);
     }
 
     SkTDArray<GMRegistry::Factory> gms;
@@ skipping 13 matching lines @@
     tasks.wait();
 
     reporter.updateStatusLine();
     SkDebugf("\n");
     report_failures(reporter);
 
     SkGraphics::Term();
 
     return reporter.failed() > 0;
 }
+
+#if !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_NACL)
+int main(int argc, char** argv) {
+    return tool_main(argc, argv);
+}
+#endif